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Phone:
+86-15928560945
The NGA-401 DRM Radio AM Modulator is a high-efficiency, fully solid-state 200kW transmitter designed for the 531-1602KHz medium wave band. Featuring Direct Digital Synthesis (DDS), advanced surge protection, and scalable power levels, it ensures stable, high-quality broadcasts. With 86% efficiency, redundant circuits, and user-friendly controls, it's a reliable solution for modern AM and DRM digital broadcasting.
High-Efficiency Digital Modulation – Uses Direct Digital Synthesis (DDS) for precise RF envelope generation, ensuring high modulation quality and efficiency.
Fully Solid-State Design – 100% solid-state architecture with 250VDC operation, providing enhanced stability, reliability, and energy efficiency.
Advanced Lightning Protection – Integrated surge protection system prevents electrical damage, ensuring uninterrupted broadcasting.
Scalable Power Levels – Three selectable output power levels (50kW, 100kW, 200kW) for flexible broadcasting applications.
User-Friendly Interface – LED signal flow diagrams, multi-function meters, and remote control for easy operation and maintenance.
High Modulation Capability – Supports 100% continuous sinusoidal modulation with superior audio bandwidth and stability.
| RF Load lmpedance | 500 unbalanced (75 to 2300customizable per user requirements) |
| RF Harmonics and Spurious Emissions | Better than FCC and CClR regulations |
| Power supply | Available in 10KV AC or three-phase four-wire 380V AC (365V to 395V and 395V to 425Vapplicable per user requirements) |
| Power supply Variation | +5% voltage variation,50Hz +2% frequency variation |
| Power Factor | Typical value of 0.98 |
| Overall Efficiency | Greater than 85% at 200KW |
| RF Monitoring signal | 10VRMS RF modulation output sampling, 5V TTL RF frequency detectionsampling |
Audio Specifications
| Audio Frequency Response | +1% from 50 to10000Hz(1KHz OdB) |
| Harmonic Distortion | <1% at 50 to 100KW, M=0.950Hz-8KHz;<1.5% at 10 to 50KW, M=0.950Hz-10KHz |
| Carrier Drop | <2% |
| Hum and Noise | <-62dB relative to 1KHz, 100%modulation |
| Positive Peak Modulation Capability | 100% |
| Continuous Operation Capability | 24 hours |
Environmental Requirements
| Ambient Temperature | -10 to 45°C, derating 2°C per300 meters elevation |
| Relative Humidity | 0 to 90% (25°C non-condensing) |
| Air Pressure | 86 to 106 Kpa (relative to 4000 metersabove sea level) |
Physical Parameters
| Dimensions (WxHxD) | 4480 x2150 x1150m |
| Weight | 2700 Kg |
